JSFiddle - React, Tailwind, and code Playground
HTML
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<div class="container">
<div class="row">
<div class="col-sm-12 col-sm-push-12 col-md-7">LEFT</div>
<div class="col-sm-12 col-sm-pull-12 col-md-5">RIGHT</div>
</div>
</div>